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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ededa68dab62f13e90f4c1719bfd91a44f95c7e297372a630431494aa53777db' 
  AND token = 'fItg5Do0ry39I4aLFW3F+THbhL8gVIEn6ZRAGXxX4Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}